Writing Prompt: Crossing the line

The topic for this week's writing prompt is "crossing the line." Please write something—story, poem, essay, true confession, or whatever else you might imagine—based on this topic.

Here's a small beginning for a story I'm writing on the topic.

“This is it. You finally pushed my limits. You finally crossed the line. No more redrawing the boundaries to suit your needs, no more starting over after you go too far.” He waved his hands in dismissal.